Nobody has brought up the use of just plain engine oil......good ol' 5w-30.



The reason I'm trying engine oil was the failure of "Blue Block" ARO. The failure happened in an OS. .25 fx airplane engine on an airboat The boat had a blow over and dunked the engine, I did the standard removal of water from the engine and ran the boat again for about 3 (4oz) tanks so I'm fairly certain that all the water was "ran out".

For storage I removed the fuel from the tank and capped it off. I put the glow ignitor on the engine and tried to start it just to make sure there wasn't and stray fuel in the engine....I then LITERALLY flooded the engine with the ARO (probably 2-3 tablespoons) and rotated the engine over to ensure coating of all the parts. I emptied all the excess ARO and rolled the engine over with the starter to further coat the inside. I stuffed a small ball of cloth into the carb and exhaust holes, capped the fuel intake nipple and the pressure nipple and put it up for the winter.


Come spring, I wanted to run the boat, but the engine would not roll over...even by hand. I took it apart and ALL the steel surfaces were severely rusted. The bearings were almost seized and the crank was lightly pitted.

Now, I believe that all the water was out because of the explanation above, but I don't want to place all blame on the ARO, because I do use it in my RC10-gt and my T-Maxx and never had a problem.


Is it possible for large amounts of water to remain in an engine even after 40 minutes of running and being flooded with ARO?

Is it possible to use too much ARO?

Why not just use engine oil and flood the engine with that instead of ARO?? It protects our real car engines...why not the rc engines?